Thread: Impeller change
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Old 03-21-2017, 02:26 PM   #16
dhays
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City: Gig Harbor
Country: United States
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 8,429
On my sailboat I have a Yanmar 4JH4E engine. Only 56hp. I change the impeller every year. The impellers have never shown any sign of wear.

I am not sure what I will do on my Cummins QSB 5.9L 380hp engine. I changed the impeller right after I bought it last spring. The impeller had not been changed in a few years and it looked pristine. The impeller on my Yanmar is cheap. The impeller for the Cummins is not.

At this point, I am planning on inspecting the impeller after a year. The Cummins manual calls for inspecting the impeller at 250 hours or 6 months. Just opening up the pump and looking at it. It calls for removing the impeller at 500 hours or 1 year. Cleaning and inspecting the interior of the pump, inspecting the impeller but only replacing it if it is excessively worn.

Part of me says that if you are bothering to remove the thing, you might as well put a new one in. We will see.
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Dave
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